KR20130053831A

KR20130053831A - Method and apparatus for creating personal sound zone

Info

Publication number: KR20130053831A
Application number: KR1020110119502A
Authority: KR
Inventors: 임형준; 김영태; 조던 취어; 스티브 엘리엇
Original assignee: 삼성전자주식회사; 유니버시티 오브 사우스앰톤
Priority date: 2011-11-16
Filing date: 2011-11-16
Publication date: 2013-05-24

Abstract

PURPOSE: A personal acoustic sound space generation method and an apparatus thereof are provided to focus sound to a specific region with a small size array. CONSTITUTION: A personal acoustic sound space generation apparatus(100) includes an array part(110) and a control signal generation part(130). The array part includes at least three transducers comprising an open port formed in an opposite direction to the direction toward listeners as being arranged vertically to the formation direction of a sound beam. The control signal generation part generates a control signal for the array part, and forms a sound beam in a vertical direction to the arrangement direction of the three transducers. [Reference numerals] (110) Array part; (130) Control signal generation part; (AA) Source signal; (BB) Multichannel filter; (CC) Convolution engine; (DD) Multichannel power amplifier

Description

METHOD AND APPARATUS FOR CREATING PERSONAL SOUND ZONE}

The following embodiments are directed to a method and apparatus for creating a personal acoustic space.

There is a technology that creates a personal sound zone that does not cause noise pollution to others, and can deliver sound only to a specific listener without earphones or a headset. In order to form a personal acoustic space, the directivity of sound generated when a plurality of acoustic transducers are driven may be used. However, when the sound transducer is configured as an array to send or collect sounds to a personal sound zone, there is a problem in that sounds are easily distributed to other spaces in a low frequency band. In particular, in the case of a personal electronic product having a small size, such as a mobile device, in addition to the above-described problems, due to the limitation of array size and the number of transducers that can be installed, There is difficulty.

According to an embodiment, an apparatus for generating a personal acoustic space includes at least three transducers arranged perpendicularly to a direction in which a sound beam is formed, each of the at least three transducers having an open port formed in an opposite direction toward the listener. An array unit including; And a control signal generator configured to generate a control signal for the array unit to form the sound beam in a direction perpendicular to the direction in which the at least three transducers are arranged.

Each of the at least three transducers is provided in a direction toward the listener, and each of the transducers generates acoustic resistance in a direction different from the direction toward the listener and is generated from each of the transducers. It may be a phase shift driver that generates directivity in the direction towards the listener by a method of reducing rear radiation that is generated.

The spacing between the at least three transducers may be the same.

The control signal generator may have a gain value different from a control signal for the transducers located at the left and right sides of the transducer located at the center of the at least three transducers. Can be controlled to have.

The control signal generator may control the control signals for the transducers located at the left and right sides of the transducer located at the center of the at least three transducers to have the same gain value and the same phase.

The control signal generator may further include an equalizer for compensating a difference in volume and frequency response for each frequency caused by an irregular response of the phase shift driver and a phase and a gain value between the at least three transducers.

According to an embodiment, the method of generating a personal sound space may be performed by using each of at least three transducers included in the array, perpendicular to the arrangement direction of the array, to form a personal sound zone at a listener's position. Generating a sound beam in a direction; And inputting control signals having a phase inverted with respect to at least three transducers included in the array.

Each of the at least three transducers is provided in a direction toward the listener, and each of the transducers generates acoustic resistance in a direction different from the direction toward the listener and is generated from each of the transducers. It may be a phase shift driver that generates directivity in the direction of the listener by a method of reducing rear radiation that is generated.

The method may further include disposing the at least three transducers at equal intervals.

Controlling the control signal for the transducer located in the middle of the at least three transducers to have a different gain (gain) and the control signal for the transducers located on the left, right of the transducer located in the center It may further comprise a step.

The method may further include controlling the control signals for the transducers located at the left and right sides of the transducers located in the center of the at least three transducers to have the same gain value and the same phase.

Compensating for the frequency change and frequency response caused by the irregular response of the phase shift driver and the difference between the phase and gain values between the at least three transducers.

According to an embodiment, by inputting control signals having a phase inverted with respect to each of at least three transducers included in the array, the sound may be concentrated in a specific sound zone even with a small array.

According to the embodiment, by generating a sound beam in a direction perpendicular to the arrangement direction of the array, the amount of transducers required in the thickness direction is reduced to enable the device to be slimmed.

In addition, according to an embodiment, by configuring an end-fire array in the direction of the listener, it is possible to effectively cancel the sound radiated to the back of the listener, and obtain high directivity in the front direction of the listener. .

1 is a block diagram of an apparatus for generating a personal acoustic space, according to an exemplary embodiment.
2 and 3 are diagrams for explaining the coordinate system between the array and the listener.
FIG. 4 is a diagram illustrating a result of comparing beam widths according to aperture sizes of arrays during uniform excitation. FIG.
FIG. 5 is a diagram for describing a method of solving a problem when arranging a broad side sound source according to an exemplary embodiment.
6 is a diagram for describing a change of a broadside beam pattern according to a parameter change according to an embodiment.
7 is a diagram illustrating a physical structure of a phase-shift loudspeaker according to an embodiment.
8 is a diagram illustrating an equivalent circuit of a phase-shift loudspeaker according to one embodiment.
FIG. 9 is a diagram for describing a problem of arranging a 1 ^st order end-fire sound source according to one embodiment.
FIG. 10 is a diagram illustrating a change of a beam pattern for a parameter mu (μ) in a 1 ^st order end-fire according to an embodiment.
FIG. 11 illustrates a beam pattern generated by a method of generating a personal acoustic space, according to an exemplary embodiment.
12 is a flowchart illustrating a method of generating a personal acoustic space, according to an exemplary embodiment.
13 is a diagram illustrating an arrangement of an array according to an exemplary embodiment.
FIG. 14 is a diagram illustrating an example in which an array is mounted on a personal acoustic device. Referring to FIG.
15 is a diagram illustrating a signal processing procedure in a personal acoustic space generating device according to one embodiment.

Problems to be considered for creating a personal sound space in a personal sound device having a small size, such as a mobile device is as follows.

The first is the size problem of the beam width, the size of the acoustic space formed in the array using the acoustic transducer increases in proportion to the wavelength. Therefore, in the low frequency region where the length of the wavelength is similar to or larger than the aperture size of the array, the size of the formed acoustic space becomes large, and it becomes impossible to control the size of the beam width with respect to the sound zone. Physical limits arise.

The second problem is the integration of acoustic transducers constituting the array. In the case of a personal or portable electronic device having a small size, the number of sound transducers that can be integrated is limited. Therefore, only a few acoustic transducers should generate a sound beam. However, when the number of acoustic transducers generating a sound beam is small, it is not possible to amplify sufficient sound pressure in the acoustic space simply by superposing sound waves.

The third problem is the control of back radiation. When generating a sound beam in a direction perpendicular to the array in a linear array, the rear sound beam is generated in a symmetrical form with the front surface by sound waves diffracted to the rear surface. Diffraction can occur easily, especially in small devices, which can produce a rear sound beam of the same size as the front.

Accordingly, in one embodiment, there is provided an apparatus and method for generating acoustic spaces in which a small transducer array having a smaller number of acoustic transducers not only controls the sound beam but also suppresses rear radiated sound of the acoustic apparatus.

In addition, an embodiment uses a new array arrangement structure and signal processing technology to ensure sufficient sound pressure differential over the entire frequency band, and in particular, an acoustic space capable of focusing sound even when the size of the array is extremely small compared to the wavelength. It provides a generating device and method.

1 is a block diagram of an apparatus for generating a personal acoustic space, according to an exemplary embodiment. Referring to FIG. 1, the apparatus 100 for generating a personal sound space includes an array unit 110 and a control signal generator 130.

The array unit 110 includes at least three transducers arranged perpendicular to the direction in which the sound beams are formed. Hereinafter, the transducer means a sound transducer.

In addition, each of the three transducers has an open port (or cavity) formed in the opposite direction to the listener.

Here, each of the at least three transducers is installed in a direction toward the listener, and in each of the transducers, a method of generating acoustic resistance in a direction different from the direction toward the listener to reduce the rear radiation generated from each of the transducers. By means of a phase shift driver that generates directivity in the direction towards the listener.

Acoustic resistance can be formed by attaching a sheet of metal gauze in a direction different from the direction from the transducer toward the listener (ie, the direction in which the open port is formed). For example, assume that the direction from the transducer toward the listener is A side and the opposite direction is B side. Then, acoustic resistance may be formed on the B surface of the transducer using, for example, a sheet of metal gauze or the like.

The spacing between at least three transducers in the array unit 110 may be the same.

An arrangement method of an array including at least three transducers in the array unit 110 will be described with reference to FIG. 11 to be described later.

The control signal generator 130 generates a control signal for the array unit 110 to form a sound beam in a direction perpendicular to the direction in which at least three transducers are arranged.

The control signal generator 130 includes transducers (side transducers) positioned at the left and right sides of the transducer in which the control signal for the transducer (middle transducer) located at the center of the at least three transducers is located at the center. It is possible to generate a control signal to have a gain value different from the control signal for.

The control signal generator 130 may control the control signals for the transducers (side transducers) located at the left and right sides of the transducer located at the center of the at least three transducers to have the same gain value and the same phase. Can be controlled.

2 and 3 are diagrams for explaining the coordinate system between the array and the listener. 2 illustrates a coordinate system between a listener and a broadside array having a delay & sum structure.

In FIG. 2, let R be the distance between the listener and the transducer at a position spaced apart from the center of the array by r in the direction of the angle θ and spaced by x from the center of the array.

Then, the distance R between the listener and the transducer may be approximated by Equation 1 below.

Where r is the distance from the center of the array to the listener, θ is the angle at which the listener is located with respect to the center of the array, and x is the distance from the center of the array to the transducer.

The sound pressure P (r, θ) at the position (distance R) can be expressed as shown in Equation 2 below.

Where q (x) represents the control signal of the transducer at the x position, k represents the wavelength, A represents the amplitude and L represents the aperture size of the array.

In Equation 2, the sound pressure P (r, θ) is briefly expressed as a function of distance and direction only, and has the form as shown in Equation 3 below.

here,

to be.

Thus, the pattern of the sound beam becomes a Finite Fourier Transform (FFT) of the control signal q (x) of the transducer.

As the aperture size of the array is smaller, the Fourier transform result has a wider distribution, so the width of the sound beam increases. For example, when all transducers have the same excitation, the beam pattern b (θ ) may be expressed as Equation 4 below.

That is, the beam pattern b (θ ) is in the form of a sink function that maximizes in the vertical direction of the array, and has a shape that is widened in inverse proportion to the aperture size L. FIG.

When an appropriate time delay is applied to each array component in FIG. 2, the arrangement direction of the array and the direction of generating the sound beam may be parallel as shown in FIG. 3. Although the shape of the generated sound beam may not be symmetrical in the case of FIG. 3, if an appropriate time delay is applied to each array element, as in the broadside beam, the aperture size may be limited. Only sound beams with a wide width can be made. See the description of FIG. 4 for the broadside beam.

FIG. 4 is a diagram illustrating a result of comparing beam widths according to aperture sizes of arrays during uniform excitation. FIG. 4 shows the beam pattern of the array when the aperture size L is 1 m and 0.1 m.

As described above with reference to FIGS. 2 and 3, the delay & sum structure applies a time window to each acoustic transducer or compensates for the distance difference R between the listener and each acoustic transducer. time delay).

The beam pattern in the delay & sum structure is almost in phase in a compact source arrangement. According to the Fourier transform relationship, the beam pattern does not escape the limitation due to the aperture size in any of the methods.

For example, if the sound beam uniformly excited in [Equation 4] restricts the beam width of the main lobe to the position of the first null,

Is the angle

Has a limit that is half width of the main lobe.

The sound beam in which the direction of the sound beam is perpendicular to the array direction of the array is called a broadside beam. The sound beam of Equation 4

It has a structure in which the front direction and the back direction are symmetrical.

FIG. 5 is a diagram for describing a method of solving a problem with a broadside sound source arrangement, according to an exemplary embodiment.

First, a description will be given of a method for generating a sound beam having a higher directivity than the delay & sum structure by arranging the transducer in the broadside direction.

When generating a broadside sound beam with three sound sources arranged as shown in FIG. 5, the control signal q introduced into each transducer in a phase inverted form may be expressed as in Equation 5 below. .

In addition, the sound pressure p (θ) generated by the control signal q can be expressed by Equation 6 below.

In Equation 6, the sound pressure p (θ) has a secondary directivity according to the angle θ. E.g,

, The sound pressure (p (θ)) is

Can have directivity.

The effect of the broadside sound source arrangement can be obtained even when using three or more sound sources. In this case, since the number of necessary sound sources is increased, it is generally not preferable, but may be included as one of various embodiments.

In the case where a larger number of sound sources are used, the control signal is generally expressed by Equation 7 below.

Here, h represents an arbitrary window function, and convolution of a window function h having n coefficients with q yields a general formula of a control function for n + 2 sound sources.

For example, the control function q 'in the case of using a single window having two coefficients can be expressed by Equation 8 below.

In one embodiment, higher directivity can be obtained by generating sound pressure so that its phase is inverted in an array arranged in a direction perpendicular to the direction of the listener.

6 is a diagram for describing a change of a broadside beam pattern according to a parameter change according to an embodiment.

Referring to FIG. 6, parameter zeta (

It can be seen that the directivity of the sound beam pattern increases with the change of. Also,

It can be seen that the sound beam has the maximum directivity in the vicinity.

By using the method described above with reference to FIG. 5, directivity in the horizontal direction can be greatly increased. However, due to the nature of the broadside array, the sound beam pattern

Likewise, they appear symmetrically in the front and rear.

Accordingly, in one embodiment, the characteristics of the end-fire array and the characteristics of the broadside array are combined with each other to effectively remove the sound emitted to the rear surface and to have a high directivity in the front direction.

7 illustrates a physical structure of a phase shift loudspeaker according to an embodiment, and FIG. 8 illustrates an equivalent circuit of the phase shift loudspeaker according to an embodiment. Here, the phase shift loudspeaker may be used in the same sense as the phase shift driver.

Referring to the equivalent circuit of FIG. 8, the phase shift loudspeaker is a cabinet, that is, acoustic compliance C _A , resistance R _A of the rear port and acoustic inertance of the rear port ( Or three components of an acoustic mass.

The phase shift φ at low frequency is related to the value of acoustic resistance, and is expressed by Equation 9 below.

Where φ is the difference between the phase R caused by the time delay caused by the resistance R _A of the rear port and the internal space of the speaker, that is, acoustic compliance C _A , and ω is the Measurement frequency.

Equation 9 may be expressed by a time delay τ as shown in Equation 10 below.

In addition, Equation 9 is the difference between the acoustic equivalent path length between the front diaphragm and the rear opening radiation of the speaker as shown in Equation 11 below. Can be represented by

Where c ₀ Means sound speed.

The acoustic compliance C _A of the volume can be expressed as Equation 12 below.

Where V is the volume of the enclosure (ie, speaker space) and ρ ₀ is the air density inside the speaker.

Therefore, if Equation 12 is substituted into Equation 11, the acoustic equivalent path length h can be expressed as Equation 13 below.

It can be seen from Equation 13 that the acoustic equivalent path length h can be changed by adjusting the volume of the speaker space or adjusting the resistance value of the rear opening.

The total pressure field emitted by the phase shift loudspeaker depends in part on the amplitude of the sound emitted by the rear port.

If the acoustic parameters of the phase shift loudspeaker are properly selected, the phase shift loudspeaker is not affected by the magnitude of the pressure radiated by the rear. Therefore, the magnitude of the pressure radiated by the front diaphragm is equal to the magnitude of the pressure radiated by the rear port.

Under this assumption, the complex volume velocity radiated by the rear port may be expressed by Equation 14 below.

Here, the phase inversion initiated by the operation of the phase shift loudspeaker is represented by a minus sine wave,

Denotes a phase shift caused by resistance and compliance.

According to the far-field estimation, the resulting far-field pressure can be expressed as Equation 15 below.

If the equivalent path length is smaller than the wavelength (that is, as shown in Equation 16 below), the exponential term in Equation 15 may be expressed as Equation 17 below.

Therefore, the total pressure (ie, sound pressure) p radiated by the phase shift loudspeaker can be approximated by Equation 18 below.

Figure 9 is a first end, according to one embodiment - Fire (1 ^st order end-fire) is a view for explaining the problem with the sound source arrangement, 10 is a first end, such as 9-fire (1 ^st order end -fire) shows the change of the beam pattern for the parameter mu (μ).

In Equation 18, the sound field is expressed as the sum of the monopole term and the dipole term, respectively, and according to the parameter mu (μ), the directivity will change in the form of the weight of the monopole term being changed. Able to know.

Referring to FIG. 10, the end-fire beam pattern may effectively remove back radiation by adjusting the parameter mu (μ). On the other hand, since the end-fire technique generates a sound beam in a direction perpendicular to the arrangement direction of the array, the transducers can be arranged linearly and coupled to the array according to the method of [Equation 5].

Thus, according to one embodiment, back radiation can be effectively eliminated by combining the characteristics of the broadside array and phase shift drivers.

11 is a diagram illustrating an example of a beam pattern generated by a method of generating a personal acoustic space, according to an exemplary embodiment. As described above, the phase shift loudspeaker can stably obtain end-fire directivity.

12 is a flowchart illustrating a method of generating a personal acoustic space, according to an exemplary embodiment. The personal acoustic space generating apparatus (hereinafter, referred to as a “generating apparatus”) according to an exemplary embodiment may arrange at least three transducers at equal intervals (1010). At this time, the order of adjusting the spacing of the at least three transducers is not necessarily limited according to one embodiment, and may be performed after the procedure of 1030 is performed.

The generating device then generates a sound beam in a direction perpendicular to the arrangement direction of the array using each of the at least three transducers included in the array to form a personal sound zone at the listener's location. 1010.

Here, each of the at least three transducers has an open port formed in the opposite direction toward the listener and rear radiation generated from each of the transducers by adjusting the acoustic resistance formed in a direction different from the direction toward the listener. Phase shift driver (or phase shift loudspeaker).

As described above, the acoustic resistance may be formed by attaching a sheet of metal gauze in a direction different from the direction toward the listener in the transducer.

The generating device inputs the control signals in the form of inverted phases to at least three transducers included in the array (1030).

The generation device may control the control signals for the transducers (side transducers) located at the left and right sides of the transducers positioned in the middle of the at least three transducers to have the same gain value and the same phase (1040). ).

In addition, the generating device controls the transducers (side transducers) located at the left and right sides of the transducer located at the center of the at least three transducers (center transducer). It can be controlled to have a gain value different from the signal.

The generating device may compensate (1050) for the difference in phase and gain values between the frequency response and the frequency response and the at least three transducers caused by the irregular response of the phase shift driver.

13 illustrates an array arrangement according to one embodiment.

Referring to FIG. 13, an array for generating a broadside beam is constructed using three transducers arranged perpendicularly in the direction of the listener. At the same time, the end-fire beam can be configured towards the listener using the phase shift driver as the transducer of the array as described above.

In the array configuration, as described above, the sound pressure p ( θ ) generated by Equation 18 may be expressed as a product of two sound beam patterns as shown in Equation 19 below.

The sound beam pattern according to [Equation 19] is directed (directivity)

By not generating the sound backwards, it produces clear directivity forward by the broadside array.

The control signals for the transducers in the middle of the array have different gains than the control signals for the transducers (side transducers) located on the left and right sides of the center transducer. Each of the control signals for the side transducers may have the same gain and the same phase from each other.

FIG. 14 is a diagram illustrating an example in which an array is mounted on a personal acoustic device. Referring to FIG.

Referring to FIG. 14, the array unit receives a control signal composed of multi-channels as an input to generate a sound beam having directivity. The array portion can include at least three transducers.

The array unit may be configured such that the loudspeaker disposed at the front and the rear ports of the phase shift structure disposed at the rear face each other as shown in FIG. 14.

Referring to FIG. 14, the directivity in the horizontal direction may be improved by the placement of at least three transducers in a broadside array, ie a personal acoustic device, which produces a sound beam perpendicular to the arrangement direction of one array. In addition, the back radiation can be controlled by forming an end-fire beam by the radiation of the rear pods of phase-shift drivers.

Each of the at least three transducers has a cavity, or open port, of the loudspeaker formed in the opposite direction towards the listener. And each of the at least three transducers has an acoustic resistance in a direction different from the direction towards the listener, for example composed of a metal gauze plate. The acoustic resistance can be adjusted to reduce rear radiation generated from each of the at least three transducers, ie to give end-fire directivity.

15 is a diagram illustrating a process of processing a signal in an apparatus for generating a personal acoustic space, according to an exemplary embodiment. Referring to FIG. 15, the apparatus for generating personal acoustic spaces may include a control signal generator 1340 and an array unit 1350. The control signal generator 1340 may include a multi-channel filter 1310 and a power amplifier 1320.

The array unit 1350 may include at least three phase-shift transducers. Each of the at least three transducers has an open port formed in an opposite direction toward the listener and an acoustic resistance formed in a direction different from the direction toward the listener to prevent rear radiation from each of the transducers. The reducing phase shift driver can be.

The control signal generator 1340 may further include an equalizer (EQ) 1330 that compensates for frequency response and sound volume variation for each frequency caused by the use of the phase shift driver.

The control signal generator 1340 generates a control signal suitable for the arrangement of the array unit 1350 according to an embodiment, and the control signal may have the following characteristics.

The control signal for generating high directivity may be divided into control signals 1301-1, 1301-2, and 1301-3 for excitation of the array unit 1350.

Each of the control signals 1301-1, 1301-2, and 1301-3 controls at least three transducers constituting the array unit 1350 to be perpendicular to a direction in which the at least three transducers are arranged. It may be composed of signals of at least three channels for generating a sound beam.

The signal A12 for controlling the transducer located in the center of the array unit 1350 has a form in which phases are inverted from each other (ie, opposite in sign) with the signal A11 for controlling the remaining transducers. (See Equation 5).

In this case, the signals A11 for controlling the transducers located at the left and right sides of the transducer located at the center in the array unit 1350 are the same.

In addition, in the control signal generated by the control signal generator 1340, the directivity of each frequency is controlled by an optimization technique.

For example, three transducers in the array portion 1350 are acoustics between the dark zone at all positions and the mean square pressure of the sound pressure in the bright zone at the listener's head. It operates at each frequency to maximize the contrast.

In addition, since the sound beam is generated in a direction perpendicular to the arrangement direction of the array unit 1350, the number of transducers required in the thickness direction is reduced.

In addition, by constructing an end-fire array in the direction of the listener, the sound radiated to the back of the listener can be effectively canceled, and high directivity can be obtained in the front of the listener.

The above-described methods may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by equivalents to the appended claims, as well as the appended claims.

1310: multichannel filter
1320: power amplifier
1330: equalizer
1340: control signal generator
1350: array unit

Claims

An array portion comprising at least three transducers arranged perpendicular to the direction of formation of the sound beam, each of the at least three transducers having an open port formed in an opposite direction towards the listener; And
Control signal generation unit for generating a control signal for the array unit to form the sound beam in a direction perpendicular to the direction in which the at least three transducers are arranged
Personal acoustic space generating device comprising a.

The method of claim 1,
Each of the at least three transducers
A direction toward the listener, provided in a direction toward the listener, by generating acoustic resistance in a direction different from the direction toward the listener in each of the transducers, thereby reducing the back radiation generated from each of the transducers Personal acoustic space generation device, which is a phase shift driver for generating directivity in a linear manner.

The method of claim 1,
Wherein the spacing between the at least three transducers is the same.

The method of claim 1,
The control signal generator
Create a personal acoustic space such that the control signal for the transducer located in the middle of the at least three transducers has a different gain value from the control signal for the transducers located on the left and right of the transducer located in the center Device.

The method of claim 1,
The control signal generator
And the control signals for the transducers located at the left and right sides of the center transducer among the at least three transducers have the same gain value and the same phase.

The method of claim 2,
The control signal generator
Equalizer that compensates for the difference in volume and frequency response by frequency caused by the irregular response of the phase shift driver and the phase and gain values between the at least three transducers
Personal acoustic space generating device further comprising.

Generating a sound beam in a direction perpendicular to the arrangement direction of the array using each of at least three transducers included in the array to form a personal acoustic space at the position of the listener; And
Inputting control signals having a phase inverted with respect to at least three transducers included in the array;
Personal acoustic space generation method comprising a.

The method of claim 7, wherein
Each of the at least three transducers
Installed in a direction toward the listener, and in each of the transducers, a sound resistance is generated in a direction different from the direction toward the listener to reduce the rear radiation generated from each of the transducers in the direction of the listener. A method of creating a personal acoustic space, which is a phase shift driver for generating directivity.

The method of claim 7, wherein
Placing the at least three transducers at equal intervals
Personal sound space generation method further comprising.

The method of claim 7, wherein
Controlling the control signal for the transducer located in the middle of the at least three transducers to have a gain value different from the control signal for the transducers located on the left and right sides of the center positioned transducer;
Personal sound space generation method further comprising.

The method of claim 7, wherein
Controlling the control signals for the transducers located at the left and right sides of the transducer located at the center of the at least three transducers to have the same gain value and the same phase to each other;
Personal sound space generation method further comprising.

9. The method of claim 8,
Compensating for a difference in volume and frequency response per frequency caused by an irregular response of the phase shift driver and a phase and gain value between the at least three transducers
Personal sound space generation method further comprising.

A computer-readable recording medium having recorded thereon a program for performing the method of any one of claims 7 to 12.